I'm not quite sure what had happened to Earth but it was (once again in my dreams) pretty barren and war-torn. There were ruins here and there but the overwhelming scenes were of red/orange sand, sand dunes, sand storms, and then some more sand to top it off. Mixed in the sand were chunks of glass (maybe we'd had a nuclear war or something?).
Anyway there was muching chasing around (or running away) involving dune buggies and nasty bird-like creatures with really taut skin clawing their way through portals and attacking anyone they could find. My sisters and mother were there and joined myself and a number of other people in conducting some sort of weird ritual to try and seal the portals. We were all in this little wooden shanty hut chanting away as a really bad sandstorm whipped at the rafters and the sound of demonic-chattering crept closer, and closer....
It was cool and I hope I manage to revisit that one and learn more about it sometime soon :)